%A Rui Xu(徐瑞), Zu-Jun Wang(王祖军), Yuan-Yuan Xue(薛院院), Hao Ning(宁浩), Min-Bo Liu(刘敏波), Xiao-Qiang Guo(郭晓强), Zhi-Bin Yao(姚志斌), Jiang-Kun Sheng(盛江坤), Wu-Ying Ma(马武英), Guan-Tao Dong(董观涛) %T Displacement damage in optocouplers induced by high energy neutrons at back-n in China Spallation Neutron Source %0 Journal Article %D 2020 %J Chin. Phys. B %R 10.1088/1674-1056/ab5efb %P 14210-014210 %V 29 %N 1 %U {https://cpb.iphy.ac.cn/CN/abstract/article_122175.shtml} %8 2020-01-05 %X Neutron radiation experiments of optocouplers at back-streaming white neutrons (back-n) in China Spallation Neutron Source (CSNS) are presented. The displacement damages induced by neutron radiation are analyzed. The performance degradations of two types of optocouplers are compared. The degradations of current transfer ratio (CTR) are analyzed, and the mechanisms induced by radiation are also demonstrated. With the increase of the accumulated fluence, the CTR is degrading linearly with neutron fluence. The radiation hardening of optocouplers can be improved when the forward current is increased. Other parameters related to CTR degradation of optocouplers are also analyzed.